Slot machine base



FIG. 1 is a front, right, and top perspective view of a slot machine base in accordance with my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in the figures are for illustrative purposes only and form no part of the claimed invention. 

The ornamental design for a slot machine base, as shown and described. 